If I were blind, I would first use TP, then I would use baby wipes, then a wash cloth. Hopefully that would do the trick.
ok try this for yourself.<br />
Go to the bathroom, DO NOT turn on the lights, (its your body I'm sure you can find everything in the dark) Do your business, clean up..... then see if you did a through job when you feel you have finished. <br />
Practice this every night for a week, I'm sure you will have your answer.